Meanings
Usage patterns
〈薬〉を飲むto take medicine
I take this medicine every morning.
〈薬〉を塗るto apply medicine (ointment) to a wound
Please apply medicine to the wound.
〈薬〉が切れるfor medicine to run out or its effect to wear off
The medicine ran out, so I need to go buy more.
〈薬〉を処方するto prescribe medicine
The doctor prescribed medicine to lower the fever.
〈薬〉を打つto inject a drug (often illegal)
There's a rumor that he's injecting drugs.